CN106371201A - Fourier overlapping correlation imaging system and method based on computational ghost imaging - Google Patents
Fourier overlapping correlation imaging system and method based on computational ghost imaging Download PDFInfo
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Abstract
The invention provides a Fourier overlapping correlation imaging system and method based on computational ghost imaging. The system comprises a spatial filter, a spatial light modulator, an imaging module, a high speed light sensitive array, a processing module which is used for calculating the image of the corresponding position of each single pixel detector and using the image as the low-resolution image of tilted plane wave illumination whose light source is the single pixel detector, and a calculation module. The calculation module is used for carrying out Fourier transforming on the low-resolution image to acquire the move and low-pass filter of a spectrum corresponding to a target high-resolution image at the incident angle and the numerical aperture of the objective lens, splicing the overlapped relevant parts of the spectrum of the low-resolution image to acquire the spectrum of the target high-resolution image, and using a phase recovery algorithm to acquire the target high-resolution image. According to the invention, the image acquisition efficiency of the whole imaging system can be improved; measurement of a wider spectrum than an ordinary array sensor is realized; compression reconstruction of an image is realized; and the rate of single imaging is improved.
Description
Technical field
The present invention relates to optical engineering technical field, particularly to a kind of based on the Fourier's overlapping associations calculating ghost imaging
Imaging system and method.
Background technology
The space-bandwidth product that the handling capacity of conventional imaging systems (such as microscope) is generally limited by its optical imagery
Limit.The quantity that space-bandwidth product refers to the degree of freedom that optical system can be extracted from optical signalling (is often referred to distinguishable
Pixel quantity).Therefore, conventional imaging systems generally cannot directly obtain the image of wide visual field, high spatial resolution.And exist at present
Life sciences and biologic medical field, clearly observe individual cells and as observe more thin as possible under the same visual field
Born of the same parents have become urgent needss, and therefore, the space-bandwidth product improving imaging system is thus realize wide visual field, high spatial resolution images
Collection become wherein key technology bottleneck.
The usual thinking improving the space-bandwidth product of imaging system includes the mechanical scanning method based on synthetic aperture and nothing
Lens method.But, the mechanical scanning method based on synthetic aperture needs accurate frame for movement to ensure the control accuracy of system,
Thus reaching expected space-bandwidth product, and optical alignment and motion tracking make imaging process become complicated and slow；All
As digital in-line holographic and the micro- no lens imaging method of contact imaging there is also certain limitation, for example, numeral is coaxially complete
Breath cannot be imaged well to continuous sample, and contact imaging is micro- to require the close enough sensor of sample.
Content of the invention
It is contemplated that at least solving one of above-mentioned technical problem.
For this reason, it is an object of the present invention to proposing a kind of Fourier's overlapping associations imaging system based on calculating ghost imaging
System, this system can improve the image acquisition efficiency of whole imaging system, and realizes than usual array-type sensor more wide spectrum
Measurement, and realize image compression rebuild, improve single imaging speed.
Further object is that proposing a kind of Fourier's overlapping associations imaging method based on calculating ghost imaging.
To achieve these goals, the embodiment of a first aspect of the present invention discloses a kind of Fu based on calculating ghost imaging
In leaf overlapping associations imaging system, comprising: spatial filter, described spatial filter is used for producing the collimation of uniform spatial distribution
Gaussian beam；Spatial light modulator, described spatial light modulator is used for carrying out spatial modulation to described Collimated Gaussian Beam, with
Structure light to space encoding is shone；Image-forming module, described image-forming module is incident upon for shining the structure light of described space encoding
On imaging surface, and with imaging sample contact；High speed photosensitive array, described high speed photosensitive array is arranged on the transmission plane of imaging sample
Or reflecting surface, is imaged the field intensity of light field after sample for receiving different directions；Processing module, described processing module is used for basis
Calculate the image that the terrible principle being imaged calculates each single pixel detector correspondence position of high speed photosensitive array, and as with this
Single pixel detector is the low-resolution image of the slant plane wave illumination of light source；Computing module, it is right that described computing module is used for
The low-resolution image of different directions slant plane wave illumination carries out Fourier transformation, obtains corresponding to target full resolution pricture
Frequency spectrum in the moving and low-pass filtering of numerical aperture of this incident angle and object lens, by the spectrum overlapping of described low-resolution image
Related part is spliced, and obtains the frequency spectrum of target high-resolution image, and obtains target high score using Phase Retrieve Algorithm
Resolution image.
Fourier's overlapping associations imaging system based on calculating ghost imaging according to embodiments of the present invention, has excellent as follows
Point:
1st, the image realizing different inclination angle illumination gathers simultaneously, it is to avoid in fpm system, collection can only have one every time
Or the limitation that a few light emitting diode is lighted, improves the image acquisition efficiency of whole imaging system；
2nd, single pixel detector has broader spectral coverage, is capable of the survey than usual array-type sensor more wide spectrum
Amount；
3rd, using the thinking calculating ghost imaging, specific coding can be carried out to structure light, such as sinusoidal coding or Hadamard encode,
The compression that image can be realized is rebuild, and improves the speed of single imaging.
In addition, the Fourier's overlapping associations imaging system based on calculating ghost imaging according to the above embodiment of the present invention, also
Can have as follows add technical characteristic:
In some instances, described spatial filter includes: object lens, pin hole, collimating lens and optical adjusting frame, translation
Platform, wherein, described pin hole is located at the focal point of described object lens, is used for filtering the uneven veiling glare of high order, produces spatial distribution
Uniform Gaussian beam, afterwards through described collimating lens, obtains described Collimated Gaussian Beam, and described optical adjusting frame is used for solid
Fixed described object lens and collimating lens adjusting device angle, so that outgoing beam is straight, described translation stage is used for fixing described pin
Hole, the spacing between adjustment pin hole and object lens simultaneously, to ensure to obtain the height of space uniform distribution in suitable three-dimensional coordinate
This light beam.
In some instances, described spatial light modulator is used for described Collimated Gaussian Beam is entered with the tune of line amplitude or phase place
System, is shone with the structure light obtaining space encoding.
In some instances, described image-forming module is lens or lens group.
In some instances, after described different directions are imaged sample, the field intensity of light field corresponds to different directions slant plane wave
It is irradiated on imaging sample, the image shooting in imaging sample front end.
To achieve these goals, the embodiment of second aspect present invention proposes in a kind of Fu based on calculating ghost imaging
Leaf overlapping associations imaging method, comprises the following steps: builds spatial filter, and produces space by described spatial filter and divides
The uniform Collimated Gaussian Beam of cloth；Spatial modulation is carried out to described Collimated Gaussian Beam, is shone with the structure light obtaining space encoding；
By the structure light of described space encoding according to being incident upon on imaging surface, and with imaging sample contact；Receive different directions imaging sample
The field intensity of light field afterwards；Principle according to calculating ghost imaging calculates each single pixel detector correspondence position of high speed photosensitive array
Image, and as with this single pixel detector as light source slant plane wave illumination low-resolution image；To different directions
The low-resolution image of slant plane wave illumination carries out Fourier transformation, obtains frequency spectrum corresponding to target full resolution pricture at this
The moving and low-pass filtering of the numerical aperture of incident angle and object lens, by the related portion of the spectrum overlapping of described low-resolution image
Divide and spliced, obtain the frequency spectrum of target high-resolution image, and obtain target high-resolution image using Phase Retrieve Algorithm.
Fourier's overlapping associations imaging method based on calculating ghost imaging according to embodiments of the present invention, has excellent as follows
Point:
1st, the image realizing different inclination angle illumination gathers simultaneously, it is to avoid in fpm system, collection can only have one every time
Or the limitation that a few light emitting diode is lighted, improves the image acquisition efficiency of whole imaging system；
2nd, single pixel detector has broader spectral coverage, is capable of the survey than usual array-type sensor more wide spectrum
Amount；
3rd, using the thinking calculating ghost imaging, specific coding can be carried out to structure light, such as sinusoidal coding or Hadamard encode,
The compression that image can be realized is rebuild, and improves the speed of single imaging.
In addition, the Fourier's overlapping associations imaging method based on calculating ghost imaging according to the above embodiment of the present invention, also
Can have as follows add technical characteristic:
In some instances, described spatial filter includes: object lens, pin hole, collimating lens and optical adjusting frame, translation
Platform, wherein, described pin hole is located at the focal point of described object lens, is used for filtering the uneven veiling glare of high order, produces spatial distribution
Uniform Gaussian beam, afterwards through described collimating lens, obtains described Collimated Gaussian Beam, and described optical adjusting frame is used for solid
Fixed described object lens and collimating lens adjusting device angle, so that outgoing beam is straight, described translation stage is used for fixing described pin
Hole, the spacing between adjustment pin hole and object lens simultaneously, to ensure to obtain the height of space uniform distribution in suitable three-dimensional coordinate
This light beam.
In some instances, described spatial modulation is carried out to described Collimated Gaussian Beam, further include: to described collimation
Gaussian beam enters the modulation of line amplitude or phase place, is shone with the structure light obtaining described space encoding.
In some instances, by lens or lens group, the structure light of described space encoding is shone and be incident upon imaging surface
On.
In some instances, after described different directions are imaged sample, the field intensity of light field corresponds to different directions slant plane wave
It is irradiated on imaging sample, the image shooting in imaging sample front end.
The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
The above-mentioned and/or additional aspect of the present invention and advantage will become from reference to the description to embodiment for the accompanying drawings below
Substantially and easy to understand, wherein:
Fig. 1 is the structural frames based on the Fourier's overlapping associations imaging system calculating ghost imaging according to embodiments of the present invention
Figure；
Fig. 2 is in accordance with another embodiment of the present invention based on the Fourier's overlapping associations imaging system calculating ghost imaging
Experimental principle figure；
Fig. 3 is the principle schematic of spatial filter according to an embodiment of the invention；And
Fig. 4 is the flow process based on the Fourier's overlapping associations imaging method calculating ghost imaging according to embodiments of the present invention
Figure.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", " on ", D score,
The orientation of instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward " or position relationship are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark
Show the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint are relative
Importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can
To be to be mechanically connected or electrical connection；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Below in conjunction with according to embodiments of the present invention being imaged based on the Fourier's overlapping associations calculating ghost imaging of Description of Drawings
System and method.
Fig. 1 is the knot based on the Fourier's overlapping associations imaging system calculating ghost imaging according to an embodiment of the invention
Structure block diagram.Fig. 2 is in accordance with another embodiment of the present invention based on the Fourier's overlapping associations imaging system calculating ghost imaging
Experimental principle figure.As shown in figure 1, and combine Fig. 2, should based on calculate ghost imaging Fourier's overlapping associations imaging system 100 wrap
Include: spatial filter 110, spatial light modulator 120, image-forming module 130, high speed photosensitive array 140, processing module, 150 and meter
Calculate module 160.
Wherein, spatial filter 110 is used for producing the clean, Collimated Gaussian Beam of uniform spatial distribution.
In one embodiment of the invention, in conjunction with shown in Fig. 3, spatial filter 110 for example includes: object lens, pin hole, standard
Straight lens and optical adjusting frame, translation stage, wherein, pin hole is located at the focal point of object lens, is used for filtering high order uneven spuious
Light, produces the Gaussian beam of uniform spatial distribution, afterwards through collimating lens, obtains Collimated Gaussian Beam, optical adjusting frame is used
In fixing object lens and collimating lens adjusting device angle, so that outgoing beam is straight, translation stage is used for fixing pin hole, adjusts simultaneously
Spacing between whole pin hole and object lens, to ensure to obtain the Gaussian beam of space uniform distribution in suitable three-dimensional coordinate.
Spatial light modulator 120 carries out spatial modulation for collimation Gaussian beam, to obtain the structure light of space encoding
According to.Specifically, in one embodiment of the invention, spatial light modulator 120 for collimation Gaussian beam enter line amplitude or
The modulation of phase place, is shone with the structure light obtaining space encoding.In other words, that is, spatial light modulator 120 is used for collimation Gauss light
Restraint the modulation into amplitude or phase place, thus the light illumination mode required for obtaining.
Image-forming module 130 is used for the structure light of space encoding according to being incident upon imaging surface, and with imaging sample contact.?
In one embodiment of the present of invention, image-forming module 130 is, for example, lens or lens group.In other words, that is, image-forming module 130 is used for
Incident light illumination mode is acted in sample plane, it can be lens or lens group it is also possible to direct irradiation exists
On sample, this time imaging system vacancy.
High speed photosensitive array 140 is arranged on transmission plane or the reflecting surface of imaging sample, for receiving different directions imaging
The field intensity of light field after sample.In one embodiment of the invention, after different directions are imaged sample, the field intensity of light field corresponds to not
Equidirectional slant plane wave is irradiated on imaging sample, the image shooting in imaging sample front end.In other words, i.e. the photosensitive battle array of high speed
Row 140 are used for receiving the intensity of different angles after sample transmission or reflection, reversible according to single pixel imaging optical path
Principle, it is irradiated on sample corresponding to different directions slant plane wave, the image shooting in sample front end.More specifically,
The intensity of each photo-sensitive cell is modeled to the related of light illumination mode and using the openness constraint of natural scene
It is compressed perceiving as picture, be radiated on sample corresponding to the slant plane wave producing in this photo-sensitive cell angle, before sample
Hold seen image.
Each single pixel that processing module 150 is used for according to the principle calculating ghost imaging calculates high speed photosensitive array detects
The image of device correspondence position, and the low-resolution image as the slant plane wave illumination with this single pixel detector as light source.
Specifically, spatial light modulator 120 is modulated multigroup different structure light and is shone, and high speed photosensitive array 140 receives corresponding light field
Intensity, then for each single pixel detector of array, processing module 150 calculates corresponding position according to the principle calculating ghost imaging
The image put, as the low-resolution image of the slant plane wave illumination with this single pixel detector as light source.In other words, that is,
Processing module 150 is used for obtaining each different angle by repeatedly different light illumination modes from the correlation of intensity on each photo-sensitive cell
The imaging results of degree update in the overlay region of Fourier spectrum as varied illumination inclination angle, low resolution Image Iterative
Domain, thus by calculate in the way of reconstructed sample high-definition picture.
Computing module 160 is used for carrying out Fourier transformation to the low-resolution image of different directions slant plane wave illumination,
Obtain frequency spectrum corresponding to target full resolution pricture the moving and low-pass filtering of numerical aperture in this incident angle and object lens, will
The related part of the spectrum overlapping of low-resolution image is spliced, and obtains the frequency spectrum of target high-resolution image, and utilizes phase
Bit recovery algorithm obtains target high-resolution image.In other words, i.e. Fourier's overlapping associations imaging process, different directions are tilted
Plane wave illumination, low resolution Image Iterative updates in the overlapping region of Fourier spectrum, obtains high after frequency domain is widened
The frequency spectrum of image in different resolution, finally with the high-definition picture of the algorithm reconstructed sample of phase recovery in the way of calculating.
In some instances, the system of the embodiment of the present invention is applied to the imaging system of wide yardstick, from micron order to meter level,
The imaging system of wherein different scale is passed through the image-forming module between sample for the adjustment space photomodulator and is realized.
Further, the imaging system of the embodiment of the present invention is applied to the imaging system of wide spectrum, from Terahertz spectral coverage, red
To x-ray spectral coverage, the imaging system of wherein different spectral coverage is applied to not by replacement for outer spectral coverage, visible spectrum, ultraviolet spectral coverage
Same high speed photo-sensitive cell is realized.
That is, the system of the embodiment of the present invention includes improving dependent imaging by light illumination mode is carried out with code optimization
During imaging rate and image quality method.More specifically, the sinusoidal mould of the different space frequency using four-step phase-shifting
Formula illuminates, and directly obtains leaf frequency spectrum in the low-resolution image of different spaces angle from different photo-sensitive cells, then carries out
Iteration updates in the overlapping region of Fourier spectrum, thus obtaining the frequency spectrum of the high-definition picture after frequency domain is widened.
To sum up, the above embodiment of the present invention based on calculate ghost imaging Fourier's overlapping associations imaging system realize former
Reason can be summarized as: the system of the present invention produces the spy of displacement through Fourier transformation in frequency domain according to different directions slant plane wave
Property and single pixel imaging have that the reversible characteristic of light path proposes it is characterised in that building the uniform collimated beam of light distribution
System, and collimated beam is incident to the modulation that spatial light modulator carries out incident field amplitude or phase place, after being modulated
Light beam through imaging optical system or direct irradiation on imaging sample, at it, through transmission or to reflex to high speed photosensitive
Array (single pixel detector array) is gathered simultaneously.Same sample irradiates simultaneously through the light beam of repeatedly known modulating mode
Gather each photo-sensitive cell (single pixel detector) corresponding light intensity, using modulating mode and the related of the light intensity of photo-sensitive cell or
The method of person's compressed sensing obtains the imaging results of the angle corresponding to each photo-sensitive cell.Light is had according to single pixel imaging
The reversible characteristic in road, each single pixel is corresponded to the imaging results of same sample and is produced not for point source with this single pixel
The result that equidirectional slant plane wave illumination shoots in incident sample front end.Therefore, the low resolution each single pixel being obtained
The image of rate is equivalent to frequency spectrum under corresponding incident angle in the range of some for the target high-resolution image in frequency spectrum.All lists
Frequency spectrum at the spectrogram representation difference angle of the image of pixel i.e. frequency domain different translation position, finally overlapped, mutually
Association constitutes the bigger frequency spectrum of entire scope.Using all single pixel imaging results of synchronous acquisition, carry out Fourier transformation, enter
And the position being determined in target high-resolution image spectrum according to the corresponding incident angle of each photo-sensitive cell, by overlapping associations
Frequency spectrum spliced by frequency domain, obtain the frequency spectrum of target high-resolution image, and target high score obtained by inverse Fourier transform
Distinguish sample image.Due to being equivalent to the illumination that increased different angles, widen frequency spectrum, therefore, it is possible to provide wide visual field and high-altitude
Between resolution characteristic.Meanwhile, the characteristic of photosensitive array synchronous acquisition avoids conventional Fourier overlapping associations imaging system point
Source array time-sharing is lighted and is hindered the limitation that imaging rate improves it is achieved that the characteristic of high time resolution, can be to dynamic scene
Carry out realtime imaging.
Fourier's overlapping associations imaging system based on calculating ghost imaging according to embodiments of the present invention, has excellent as follows
Point:
1st, the image realizing different inclination angle illumination gathers simultaneously, it is to avoid in fpm system, collection can only have one every time
Or the limitation that a few light emitting diode is lighted, improves the image acquisition efficiency of whole imaging system；
2nd, single pixel detector has broader spectral coverage, is capable of the survey than usual array-type sensor more wide spectrum
Amount；
3rd, using the thinking calculating ghost imaging, specific coding can be carried out to structure light, such as sinusoidal coding or Hadamard encode,
The compression that image can be realized is rebuild, and improves the speed of single imaging.
Further embodiment of the present invention also proposed a kind of Fourier's overlapping associations imaging side based on calculating ghost imaging
Method.
Fig. 4 is the stream based on the Fourier's overlapping associations imaging method calculating ghost imaging according to an embodiment of the invention
Cheng Tu.As shown in figure 4, the method comprises the following steps:
Step s1: build spatial filter, and clean, uniform spatial distribution collimation Gauss is produced by spatial filter
Light beam.
In one embodiment of the invention, the spatial filter of structure for example includes: object lens, pin hole, collimating lens and
Optical adjusting frame, translation stage, wherein, pin hole is located at the focal point of object lens, is used for filtering the uneven veiling glare of high order, produces empty
Between the Gaussian beam that is evenly distributed, afterwards through collimating lens, obtain Collimated Gaussian Beam, optical adjusting frame is used for fixing object lens
With collimating lens and adjusting device angle, so that outgoing beam is straight, translation stage is used for fixing pin hole, simultaneously adjustment pin hole and thing
Spacing between mirror, to ensure to obtain the Gaussian beam of space uniform distribution in suitable three-dimensional coordinate.
Step s2: collimation Gaussian beam carries out spatial modulation, is shone with the structure light obtaining space encoding.
Specifically, in one embodiment of the invention, collimation Gaussian beam carries out spatial modulation, further includes:
Collimation Gaussian beam enters the modulation of line amplitude or phase place, is shone with the structure light obtaining space encoding.In other words, collimation Gauss
Light beam enters the modulation of amplitude or phase place, thus the light illumination mode required for obtaining.
Step s3: by the structure light of space encoding according to being incident upon on imaging surface, and with imaging sample contact.
In an embodiment of invention, for example, by lens or lens group, the structure light of space encoding is shone and be incident upon
On imaging surface.In other words, light illumination mode that will be incident is acted in sample plane, and it can be lens or lens
Group it is also possible to direct irradiation is on sample, this time imaging system vacancy.
Step s4: receive the field intensity that different directions are imaged light field after sample.Specifically, light field after different directions imaging sample
Field intensity corresponding to different directions slant plane wave be irradiated to imaging sample on, imaging sample front end shoot image.Change speech
It, for example, pass through the intensity that high speed photosensitive array receives different angles after sample transmission or reflection, according to single pixel
The reversible principle of imaging optical path, it is irradiated on sample corresponding to different directions slant plane wave, the figure shooting in sample front end
Picture.More specifically, the intensity of each photo-sensitive cell is modeled to the related of light illumination mode and utilizes nature field
The openness constraint of scape is compressed perceiving as picture, is radiated at sample corresponding to the slant plane wave producing in this photo-sensitive cell angle
In basis, the image seen from sample front end.
Step s5: each single pixel detector that the principle according to calculating ghost imaging calculates high speed photosensitive array corresponds to position
The image put, and the low-resolution image as the slant plane wave illumination with this single pixel detector as light source.Specifically,
The multigroup different structure light of spatial light modulator modulation is shone, and high speed photosensitive array receives corresponding distribution of light intensity, then for array
Each single pixel detector, the principle according to calculating ghost imaging calculates the image of correspondence position, as with this single pixel
Detector is the low-resolution image of the slant plane wave illumination of light source.In other words, that is, pass through repeatedly different light illumination modes with
On each photo-sensitive cell the correlation of intensity obtain the imaging results of each different angle as varied illumination inclination angle, low point
The Image Iterative of resolution updates in the overlapping region of Fourier spectrum, thus in the way of calculating reconstructed sample high resolution graphics
Picture.
Step s6: Fourier transformation is carried out to the low-resolution image of different directions slant plane wave illumination, is corresponded to
In target full resolution pricture frequency spectrum this incident angle and object lens the moving and low-pass filtering of numerical aperture, by low resolution
The related part of the spectrum overlapping of image is spliced, and obtains the frequency spectrum of target high-resolution image, and is calculated using phase recovery
Method obtains target high-resolution image.In other words, this step is Fourier's overlapping associations imaging process, different directions is tilted flat
Face ripple illumination, low resolution Image Iterative renewal, in the overlapping region of Fourier spectrum, obtains high score after frequency domain is widened
The frequency spectrum of resolution image, finally with the high-definition picture of the algorithm reconstructed sample of phase recovery in the way of calculating.
In some instances, the imaging method of the embodiment of the present invention is applied to the imaging system of wide yardstick, from micron order to
The imaging system of meter level, wherein different scale is passed through the image-forming module between sample for the adjustment space photomodulator and is realized.
Further, the imaging method of the embodiment of the present invention is applied to the imaging system of wide spectrum, from Terahertz spectral coverage, red
To x-ray spectral coverage, the imaging system of wherein different spectral coverage is applied to not by replacement for outer spectral coverage, visible spectrum, ultraviolet spectral coverage
Same high speed photo-sensitive cell is realized.
That is, the method for the embodiment of the present invention be light illumination mode is carried out code optimization improve dependent imaging during
Imaging rate and image quality method.More specifically, the sinusoidal model illumination of the different space frequency using four-step phase-shifting,
Leaf frequency spectrum in the low-resolution image of different spaces angle is directly obtained from different photo-sensitive cells, then is iterated updating
In the overlapping region of Fourier spectrum, thus obtaining the frequency spectrum of the high-definition picture after frequency domain is widened.
To sum up, the above embodiment of the present invention is mainly former based on the Fourier's overlapping associations imaging method calculating ghost imaging
Reason can be summarized as: the method be based on different directions slant plane wave through Fourier transformation frequency domain produce displacement characteristic with
And single pixel imaging have that the reversible characteristic of light path proposes it is characterised in that building light distribution uniform collimated beam system
System, and collimated beam is incident to the modulation that spatial light modulator carries out incident field amplitude or phase place, after being modulated
Light beam through transmission or reflexes to the photosensitive battle array of high speed at it through imaging optical system or direct irradiation on imaging sample
Row (single pixel detector array) are gathered simultaneously.Same sample irradiates and adopts through the light beam of repeatedly known modulating mode
Collect each photo-sensitive cell (single pixel detector) corresponding light intensity, using modulating mode and the related of the light intensity of photo-sensitive cell or
The method of compressed sensing obtains the imaging results of the angle corresponding to each photo-sensitive cell.Light path is had according to single pixel imaging
Reversible characteristic, each single pixel corresponds to, to the imaging results of same sample, the difference producing with this single pixel for point source
The result that direction slant plane wave illumination shoots in incident sample front end.Therefore, the low resolution each single pixel being obtained
Image be equivalent to frequency spectrum under corresponding incident angle in the range of some for the target high-resolution image in frequency spectrum.All single pictures
Frequency spectrum at the spectrogram representation difference angle of the image of element i.e. frequency domain different translation position, finally overlapped, mutually close
Connection constitutes the bigger frequency spectrum of entire scope.Using all single pixel imaging results of synchronous acquisition, carry out Fourier transformation, and then
The position being determined in target high-resolution image spectrum according to the corresponding incident angle of each photo-sensitive cell, by overlapping associations
Frequency spectrum is spliced by frequency domain, obtains the frequency spectrum of target high-resolution image, and obtains target high-resolution by inverse Fourier transform
Sample image.Due to being equivalent to the illumination that increased different angles, widen frequency spectrum, therefore, it is possible to provide wide visual field and high spatial
The characteristic of resolution.Meanwhile, the characteristic of photosensitive array synchronous acquisition avoids conventional Fourier overlapping associations imaging system point source
Array time-sharing lights the limitation hindering imaging rate raising it is achieved that the characteristic of high time resolution, and dynamic scene can be entered
Row realtime imaging.
Fourier's overlapping associations imaging method based on calculating ghost imaging according to embodiments of the present invention, has excellent as follows
Point:
1st, the image realizing different inclination angle illumination gathers simultaneously, it is to avoid in fpm system, collection can only have one every time
Or the limitation that a few light emitting diode is lighted, improves the image acquisition efficiency of whole imaging system；
2nd, single pixel detector has broader spectral coverage, is capable of the survey than usual array-type sensor more wide spectrum
Amount；
3rd, using the thinking calculating ghost imaging, specific coding can be carried out to structure light, such as sinusoidal coding or Hadamard encode,
The compression that image can be realized is rebuild, and improves the speed of single imaging.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
Multiple changes, modification, replacement and modification can be carried out to these embodiments in the case of the principle of the disengaging present invention and objective, this
The scope of invention by claim and its is equal to limit.
Claims (10)
1. a kind of Fourier's overlapping associations imaging system based on calculating ghost imaging is it is characterised in that include:
Spatial filter, described spatial filter is used for producing the Collimated Gaussian Beam of uniform spatial distribution；
Spatial light modulator, described spatial light modulator is used for carrying out spatial modulation to described Collimated Gaussian Beam, to obtain sky
Between coding structure light shine；
Image-forming module, described image-forming module is used for the structure light of described space encoding according to being incident upon imaging surface, and with imaging
Sample contact；
High speed photosensitive array, described high speed photosensitive array is arranged on transmission plane or the reflecting surface of imaging sample, for receiving not
The field intensity of light field after equidirectional imaging sample；
Processing module, described processing module is used for calculating each single picture of high speed photosensitive array according to the principle calculating ghost imaging
The image of plain detector correspondence position, and the low resolution as the slant plane wave illumination with this single pixel detector as light source
Image；
Computing module, described computing module is used for carrying out Fourier to the low-resolution image of different directions slant plane wave illumination
Conversion, obtains frequency spectrum corresponding to target full resolution pricture the moving and low pass filtered of numerical aperture in this incident angle and object lens
Ripple, the related part of the spectrum overlapping of described low-resolution image is spliced, is obtained the frequency spectrum of target high-resolution image,
And obtain target high-resolution image using Phase Retrieve Algorithm.
2. according to claim 1 based on calculating Fourier's overlapping associations imaging system of ghost imaging it is characterised in that institute
State spatial filter to include: object lens, pin hole, collimating lens and optical adjusting frame, translation stage, wherein,
Described pin hole is located at the focal point of described object lens, is used for filtering the uneven veiling glare of high order, produces uniform spatial distribution
Gaussian beam, afterwards through described collimating lens, obtain described Collimated Gaussian Beam, described optical adjusting frame is used for fixing institute
State object lens and collimating lens adjusting device angle, so that outgoing beam is straight, described translation stage is used for fixing described pin hole, with
When spacing between adjustment pin hole and object lens, to ensure to obtain the Gauss light of space uniform distribution in suitable three-dimensional coordinate
Bundle.
3. according to claim 1 based on calculating Fourier's overlapping associations imaging system of ghost imaging it is characterised in that institute
State spatial light modulator for described Collimated Gaussian Beam is entered with the modulation of line amplitude or phase place, to obtain the structure of space encoding
Illumination.
4. according to claim 1 based on calculating Fourier's overlapping associations imaging system of ghost imaging it is characterised in that institute
Stating image-forming module is lens or lens group.
5. according to claim 1 based on calculating Fourier's overlapping associations imaging system of ghost imaging it is characterised in that institute
The field intensity stating light field after different directions are imaged sample is irradiated on imaging sample corresponding to different directions slant plane wave, in imaging
The image that sample front end shoots.
6. a kind of Fourier's overlapping associations imaging method based on calculating ghost imaging is it is characterised in that comprise the following steps:
Build spatial filter, and produce the Collimated Gaussian Beam of uniform spatial distribution by described spatial filter；
Spatial modulation is carried out to described Collimated Gaussian Beam, is shone with the structure light obtaining space encoding；
By the structure light of described space encoding according to being incident upon on imaging surface, and with imaging sample contact；
Receive the field intensity that different directions are imaged light field after sample；
Principle according to calculating ghost imaging calculates the image of each single pixel detector correspondence position of high speed photosensitive array, and
Low-resolution image as the slant plane wave illumination with this single pixel detector as light source；
Fourier transformation is carried out to the low-resolution image of different directions slant plane wave illumination, obtains corresponding to target high-resolution
The frequency spectrum of image in the moving and low-pass filtering of numerical aperture of this incident angle and object lens, by the frequency of described low-resolution image
The overlapping related part of spectrum is spliced, and obtains the frequency spectrum of target high-resolution image, and obtains mesh using Phase Retrieve Algorithm
Absolute altitude image in different resolution.
7. according to claim 6 based on calculating Fourier's overlapping associations imaging method of ghost imaging it is characterised in that institute
State spatial filter to include: object lens, pin hole, collimating lens and optical adjusting frame, translation stage, wherein,
Described pin hole is located at the focal point of described object lens, is used for filtering the uneven veiling glare of high order, produces uniform spatial distribution
Gaussian beam, afterwards through described collimating lens, obtain described Collimated Gaussian Beam, described optical adjusting frame is used for fixing institute
State object lens and collimating lens adjusting device angle, so that outgoing beam is straight, described translation stage is used for fixing described pin hole, with
When spacing between adjustment pin hole and object lens, to ensure to obtain the Gauss light of space uniform distribution in suitable three-dimensional coordinate
Bundle.
8. according to claim 6 based on calculating Fourier's overlapping associations imaging method of ghost imaging it is characterised in that institute
State and spatial modulation carried out to described Collimated Gaussian Beam, further include:
Described Collimated Gaussian Beam is entered with the modulation of line amplitude or phase place, is shone with the structure light obtaining described space encoding.
9. the Fourier's overlapping associations imaging method based on calculating ghost imaging according to claim 6 is it is characterised in that lead to
Cross lens or lens group the structure light photograph of described space encoding is incident upon on imaging surface.
10. according to claim 6 based on calculate ghost imaging Fourier's overlapping associations imaging method it is characterised in that
After described different directions imaging sample, the field intensity of light field is irradiated on imaging sample corresponding to different directions slant plane wave, is becoming
The image that this front end decent shoots.
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